I modified the Payables Transaction Entry Distribution window so the Account Number appears on the first line of the scrolling window. I also added the Currency ID field to the second line of the scrolling window because the second line looked pretty desolate and needed something else. There were no other fields in the distribution table (PM10100) that looked interesting.
This modification was done on GP 2013 R2. You can download a package file for this modified form here: Modified Payables Transaction Entry Distribution